Magnifying power of a simple microscope can be increased by
(A) increasing focal length of the lens
(B) Decreasing focal length of the lens
(C) Lens of large aperture
(D) lens of short aperture
(D) None of these
Twinkling of stars is caused by
(A) Reflection of light
(B) Polarization of light
(C) refraction of light
(D) Interference of light
(D) None of these
The deepest place on earth is ____________
(A) Trench
(B) Mariana Trench
(C) Mangrove
(D) Groove
(D) None of these
Lactometer is a type of Hydrometer which is used to measure the specific gravity of _________
(A) Honey
(B) Water
(C) Milk
(D) olive oil
(D) None of these
What is the main component of bones and teeth
(A) Calcium carbonate
(B) Calcium phosphate
(C) Calcium sulphate
(D) Calcium nitrate
The largest part of the human brain is ___________
(A) Medulla oblongata
(B) Cerebellum
(C) Cerebrum
(D) None of these